Internet Package change (Ankara)

anyone know whether a mid-month change in internet packages is possible (I have TTNET at home)? I got a package with a 6GB download limit a fortnight ago and have already breached this limit so want to upgrade immediately to 50 GB (rather than wait for the end of the month) 50GB otherwise I will have to pay @TL12 for every GB in excess of 6GB, which is a bit steep.

also, if such a thing as an English helpline for TTNET exists, I would appreciate the number.

I have tried their website but cannot find this information, perhaps not unsurprisingly given that I rely on google/ bing for translations.